Finding the Fourth Proportional to 1,396.58, 1,926.66 and 865.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.58 : 1,926.66 = 865.31 : x
2. Step 2: Convert to fraction form
   1,396.58/1,926.66 = 865.31/x
3. Step 3: Cross multiply
   1,396.58x = 1,926.66 × 865.31
4. Step 4: Simplify right side
   1,396.58x = 1,667,162.98
5. Step 5: Solve for x
   x = 1,667,162.98/1,396.58
6. Step 6: Final answer
   x = 1,193.75